More answers

freckles

2 years ago

try to sub u=a-x

freckles

2 years ago

if you don't know where to go from there, show me what you have after doing that.

freckles

2 years ago

I will give one more hint just in case you aren't there and when you back I'm not here...
\[\text{ If } \int_0^a g(x) dx=\int_0^a h(x) dx \text{ then } \\ 2 \int_0^a g(x) dx=\int_0^a g(x) dx+\int_0^a h(x) dx=\int_0^a (g(x)+h(x) )dx\]